Bulletin of the
Korean Mathematical Society
BKMS

ISSN(Print) 1015-8634 ISSN(Online) 2234-3016

Article

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Bull. Korean Math. Soc. 2020; 57(4): 1033-1048

Online first article February 27, 2020      Printed July 31, 2020

https://doi.org/10.4134/BKMS.b190723

Copyright © The Korean Mathematical Society.

On conditionally defined Fibonacci and Lucas sequences and periodicity

Skylyn Irby, Sandra Spiroff

University of Alabama; University of Mississippi

Abstract

We synthesize the recent work done on conditionally defined Lucas and Fibonacci numbers, tying together various definitions and results generalizing the linear recurrence relation. Allowing for any initial conditions, we determine the generating function and a Binet-like formula for the general sequence, in both the positive and negative directions, as well as relations among various sequence pairs. We also determine conditions for periodicity of these sequences and graph some recurrent figures in {\it Python}.

Keywords: Generalized Fibonacci, linear recurrence, periodicity

MSC numbers: Primary 11B39, 15A06

Supported by: S.~Spiroff is supported by Simons Foundation Collaboration Grant \#584932